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Castor bean endosperm

Work with a variety of plant systems has shown that multiple forms of SSS are present. Studies on barley endosperm, pea seeds, wheat endosperm, sorghum seeds, teosinte seeds, spinach leaf, maize endosperm, potato tuber, and rice seed extracts have indicated the presence of at least two major forms of SSS (reviewed in Preiss and Levi, 1980 Preiss, 1988 Preiss and Sivak, 1996), designated as types I and II. In maize leaf (Dang and Boyer, 1988) and castor bean endosperm (Goldner and Beevers, 1989), only one form of starch synthase was found, but since no extensive purification was attempted, the possibility remained that existing multiforms were not separated. Indeed, Downton and Hawker (1973) did find two forms of starch synthase in maize leaf, and thus the issue of the number of forms... [Pg.75]

Electron micrographs of castor bean endosperm tissue showed the presence of proplastids with starch grains. Starch synthase was shown to be associated with the proplastid fraction of the endosperm tissue along with the starch granule (Reibach and Benedict, 1982). [Pg.117]

Goldner, W., and Beevers, H. 1989. Starch synthase and starch branching enzyme from germinating castor bean endosperm. Phytochemistry 28, 1809-1812. [Pg.178]

T. G. Cooper, J. Biol. Chem., 246 3451 (1971). The Activation of Fatty Acids in Castor Bean Endosperm. [Pg.167]

Figure 9-16. Protein distribution observed after isopycnic centrifugation of crude particles from castor bean endosperm on linear A) and stepped (B) sucrose gradients. The upper curves of each panel show the measured sucrose concentration in each fraction and the lower curves, the protein. [From T. G. Cooper and H. Beevers, J. Biol. Chem., 244 3507 (1969).]... Figure 9-16. Protein distribution observed after isopycnic centrifugation of crude particles from castor bean endosperm on linear A) and stepped (B) sucrose gradients. The upper curves of each panel show the measured sucrose concentration in each fraction and the lower curves, the protein. [From T. G. Cooper and H. Beevers, J. Biol. Chem., 244 3507 (1969).]...
Table 9-2. Distribution of Enzymes in the Subcellular Organelles from Castor Bean Endosperm... Table 9-2. Distribution of Enzymes in the Subcellular Organelles from Castor Bean Endosperm...
Figure 9-32. Separation of crude particulate fraction from castor bean endosperm using a B-XV zonal rotor. Figure 9-32. Separation of crude particulate fraction from castor bean endosperm using a B-XV zonal rotor.
A preproricin gene from Ricinus communis has been characterized by both cDNA [31] and genomic [150] cloning. Southern blot analysis has indicated that the Ricinus communis genome includes at least six lectin genes [150], In our laboratory we constructed a cDNA library using ripening castor bean endosperm poly(A)+ RNA which had been enriched for lectin precursor... [Pg.16]

Ireland, R.J. De Luca, V. Dennis, D.T. Characterization and kinetics of isoenzymes of pyruvate kinase from developing castor bean endosperm. Plant Physiol, 65, 1188-1193 (1980)... [Pg.63]

Kombrink, E. Kruger, N.J. Inhibition by metabolic intermediates of pyro-phosphate D-fructose 6-phosphate phosphotransferase from germinating castor bean endosperm. Z. Pflanzenphysiol., 114, 443-453 (1984)... [Pg.351]

Sparace, S.A., Wagner, L.K., and Moore, T.R., Jr. (1981) Phos-phatidylethanolamine Synthesis in Castor Bean Endosperm, Plant Physiol. 67,922-925. [Pg.44]

Aspartic acid is readily converted to metabolites which are degraded to CO2. Stewart and Beevers (1%7) fed [U- C]aspartate to excised intact castor bean endosperms and found more than 50% of the added aspartate disappeared in the first hour with organic acids as the primary labeled products. Malate was the major organic acid labeled and the remaining label was almost entirely in fumarate. [Pg.552]

Geranylgeranyl pyrophosphate synthetase activity has been found in carrot, pumpkin, and castor bean endosperm. In preparations from pumpkin and castor bean endosperm, it was possible to separate famesyl pyrophosphate synthetase and geranylgeranyl pyrophosphate synthetase activity. [Pg.399]

Glyoxysome Castor bean endosperm 51 27 2 9 1 3 Donaldson and Beevers (1977)... [Pg.28]

Castor bean endosperm 575,000 (64,000) 10 fiM (acetyl-CoA) 200/uM (glyoxylate) Bowden and Lord (1978)... [Pg.125]

There is presumptive evidence that the proplastid and the ofl storage organelles differ in function. Thus, Yamada and his colleagues, as well as Simcox et al., have shown that proplastids isolated from developing castor bean endosperm synthesize only oleic acid. However, the major product of fatty acid synthesis in these seeds is triricinoleoylglycerol. Galliard and Stumpf (1966) have shown that the synthesis of ricinoleic acid involves a microsomal preparation (presumably endoplasmic reticulum) which hydroxylates oleoyl-... [Pg.192]

At present, little is known about the phosphatidate phosphohydrolase step in the biosynthetic pathway to triacylglycerols. The enzyme was specifically measured by Moore et al, (1973) in subcellular fractions of castor bean endosperm and found to be located mainly in the endoplasmic reticulum, with some activity in the soluble fraction. In leaves, the highest specific activity was found in an undefined particulate fraction, whereas the m or part of the activity was soluble (Heinz, 1977). Other evidence for a specific phosphatidate phosphohydrolase activity in chloroplast membranes was indirect (Joyard and Douce, 1977). Care must always be taken to ensure that the activity is not due to a nonspecific phosphatase in view of the report by Blank and Snyder (1970) that wheat germ contains an acid phosphatase capable of dephosphorylating phosphatidic acid. The enzyme described by Moore et al. [Pg.240]


See other pages where Castor bean endosperm is mentioned: [Pg.339]    [Pg.200]    [Pg.336]    [Pg.339]    [Pg.13]    [Pg.543]    [Pg.544]    [Pg.549]    [Pg.24]    [Pg.26]    [Pg.28]    [Pg.28]    [Pg.89]    [Pg.110]    [Pg.120]    [Pg.125]    [Pg.125]    [Pg.125]    [Pg.126]    [Pg.128]    [Pg.189]    [Pg.190]    [Pg.199]    [Pg.232]    [Pg.239]    [Pg.239]    [Pg.254]   
See also in sourсe #XX -- [ Pg.239 , Pg.240 ]




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